In a food processor, puree 2 cups of the strawberries, granulated sugar, and 1 Tbsp of the orange liqueur until smooth; pour into a bowl. Slice remaining strawberries. Stir sliced strawberries, raspberries, blueberries, and blackberries into strawberry puree.

In a large bowl, melt chocolate in microwave according to package directions. Let cool slightly. Fold in mascarpone cheese. In a medium bowl, whip cream and confectioners' sugar just until stiff. Fold cream into chocolate mixture, just until combined.

Place half of sponge cake cubes into 6 glasses or dishes. Sprinkle with half of remaining 1 tablespoon of the orange liqueur. Spoon half of berry mixture over cake. Top with half of cream mixture, spreading evenly. Repeat with remaining cake, liqueur, berries, and cream. Serve, or cover and refrigerate 1 hour, or overnight. Garnish each with a strawberry.

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